This werid thing happened to me one day in which everytime I pushed the hold button it would flash and take a pic of my home screen. It wasn't intended and I couldn't return it to normal function so I restarted the phone. I thought this was a normal ability of andriod phones given that all the Apple products could do it. When I wanted to actually take a pic of my homescreen I googled it and found that you needed a program called Sdk? So what happened , how come I was able to do this without any program? I got htc sensation 4g